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    /*
     *赋值运算符
     *= 可以将符号右侧的值赋值给符号左侧的变量
     *a += 5 等价于a=a+5
     *a -= 5 等价于a=a-5
     *a *= 5 等价于a=a*5
     *a /= 5 等价于a=a/5
     *a %= 5 等价于a=a%5
     */
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